Bash 逐行读取与嵌套循环笔记

shell readline for

Bash


1
2
3
4


while read -r line;
do
   echo "$line" ;
done < input.file

Bash


1
2
3


while read x; do echo $x; done << EOF
$(ls -l $1)
EOF

Bash

1
2

ls -l $1 | while read x; do echo $x; done
ls | while read  line;do echo "/data/path/start.sh";done

Bash


1
2
3


IFS='
'
for x in `ls -l $1`; do echo $x; done

不改变当前shell的IFS;Put a sub-shell around it if you don’t want to set IFS permanently:

Bash


1
2
3


(IFS='
'
for x in `ls -l $1`; do echo $x; done)

嵌套循环

Bash


 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14


#!/bin/bash

#set -x

cd /data/app


while read -r line;
do
   if [ ! -d $line ]
   then
       echo "$line not exist"
   fi ;
done < /tmp/applist